<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <h1>我是一个HTML5网页</h1>
    <button onclick="sendMsg()">来个提示！</button>
    <script>
        function changeText(){
            document.querySelector('h1').innerText = '是我让你变的啊！'
            return Date.now()
        }
        function sendMsg(){
            objName.objKey()
        }
    </script>
</body>
</html>